While waiting for the turkey to be put in the oven, I thought I would relay my limited experience on installing a Unity Spotlight so others who are considering this can hopefully learn either what or what not to do.
Mine is a S6 with the overall length being about 14". Diameter of exposed glass is 5 1/2" diameter.
This light came off of my '53 which was crushed by my front oak tree years ago. It was one of the many items I salvaged and decided to install onto my '50. I had to drill a hole through the corner cab pillar which made me sweat just thinking about it. The mounting brakets that fasten to the cab are angled so they sit flush against the cab. The angle you drill has a direct affect on how well these brackets (especially the outside one) sit flush against the cab, so give it a lot of thought.
On the inside of the cab the spotlight shaft interferes with the interior windlace (if you have this). The hole comes through the windlace channel so I had to remove my windlace material, drill the hole, straighten up the part of the channel that was disfigured by the drilling.
Did a test install to see if everything went in ok and fastens down well without having the windlace installed. Afterwards (assuming all went well) I removed the light, installed the windlace, notched out the portion of the windlace that interferes with the hole. FYI, I find using lots of talcum powder helps slide the windlace back into place.
Afterwards, I re-installed the light which was a snug fit due to the resistance of the remaining windlace which I had to trim a little bit more. Bolted everything down and connected the wire to a positive lead I believe on my headlight switch.
Looking at my light, I could possibly trim about 2" off the shaft if I wanted to shorten it up a little but since it's not giving me bloody knuckles at this point, I'll probably leave it alone.
Here's a couple shots for reference.
http://community.webshots.com/photo/102029454/102029877iKqHdf I'd love to hear other experiences and suggestions on this so those planning to do this can benefit.
Happy Turkey Day